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Re: [gpsd-users] 1PPS not working with RPi 3 B+ and Stretch

From: Gary E. Miller
Subject: Re: [gpsd-users] 1PPS not working with RPi 3 B+ and Stretch
Date: Thu, 19 Jul 2018 12:53:45 -0700

Yo Chris!

On Thu, 19 Jul 2018 15:36:03 -0400
Chris Smith <address@hidden> wrote:

> Thanks for the reply. You're right, I need to narrow in on the
> specific PPS issue.
> That said, here's what I have from a previous session... (gpsd
> running as root with -D4 switch)

OK, but I asked several questions of you, still unanswered.

> gpsd:PROG: KPPS:/dev/pps0 assert  1531920117.000122757, sequence:
> 6237, clear   0.000000000, sequence: 0 - using: assert
> gpsd:PROG: KPPS:/dev/pps0 Assert cycle: 1000000, duration:       0 @
> 1531920117.000122757
> gpsd:PROG: PPS:/dev/pps0 Assert cycle: 1000000, duration:       0 @
> 1531920117.000122757

So you have good PPS into gpsd.

> *gpsd:PROG: PPS:/dev/pps0 Assert ignored missing last_fixtime*

But your GPS does not have a valid time yet.  No good time into
gpsd, then no time out of gpsd.

First, answet the other questions I asked.  Then tell me if cgps, or
gpsmon, is showing a valid current timestamp.  You may need to wait up
to 30 minutes after powering up the GPS to get a valid timestamp.

> gpsd:PROG: GNRMC sentence timestamped 132157.00.

See, bad time.  Usually happens after a cold start, for up to 30 minutes.

> I've contemplated disabling the other modes,

Ah, what do you mean by 'mode'?

> but I have yet to successfully "talk" to the UM-220 III NL chip.

Still waiting for alink to that GPS.

> I'll run through your list and send that output back to you as soon
> as I get my microSD card re-imaged with the same build of Raspbian
> Stretch I was using originally.

I doubt that matters at all.  gpsd could care less what OS and OS version
it runs on.

Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
        address@hidden  Tel:+1 541 382 8588

            Veritas liberabit vos. -- Quid est veritas?
    "If you can’t measure it, you can’t improve it." - Lord Kelvin

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